* m4/python.m4 (_AM_PYTHON_INTERPRETER_LIST): Prefer the generic
'pythonX' over 'pythonX.Y'. This way we select the users preferred
version for both flavors. Prefer 'python' over 'python3' but not over
'python2' so that the algorithm still finds a 'python2' even if
'python' is a Python3.
Fixes-commit: 5189c08af9
Signed-off-by: Justus Winter <justus@g10code.com>